6 layers13 × 11.1 mm
ELRS Receiver
aprskalo1/nano24-elrs-receiver
nano24: compact 2.4 GHz ExpressLRS receiver prototype with ESP32-C3, SX1281, CRSF and a printed Wi-Fi antenna. KiCad sources, BOM, Gerbers and validation notes.
47 partsCERN-OHL-S-2.0
6 layers10 × 11.5 mm
OpenRX Lite
OpenDrone-hw/OpenRX-Lite6Open-source 2.4 GHz ExpressLRS receiver with an on-board ceramic antenna.
- Size
- 10 × 11.5 mm
- Copper layers
- 6
- Thickness
- 1 mm
- Parts
- 47
- Nets
- 44
- Pads
- 233
- Tracks, vias
- 261, 88
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 1 Sep 2026
- Updated
- 1 Nov 2026
Overview
OpenRX Lite is an open-source printed circuit board by OpenDrone-hw, from the OpenDrone-hw/OpenRX-Lite repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 6-layer board of 10 × 11.5 mm with 47 parts on 44 nets, routed with 261 tracks and 88 vias.
It is built around the ESP32-C3FH4, SX1281IMLTRT and 2450FM07D0034T, with the MLZ2012M150WT000, 2450AT18A100E and CJ17-400001010B20 among its other parts. Its parts include 25 capacitors, 4 resistors, 4 inductors, 3 ICs and 1 diode. It belongs with the radio and wireless boards and the ESP32 and RISC-V boards of this library.
Main components
8
ESP32-C3FH4
QFN-32-EP(5x5)160MHz 32 Bit 3V~3.6V 400KB RISC-V Watchdog reset、Software reset、Built-in general-purpose timer、Programmable watchdog、Built-in temperature sensor、True random number generator (TRNG)、Storage encryption、Infrared remote control QFN-32-EP(5x5) Microcontrollers (MCU/MPU/SOC) ROHSEspressif SystemsMicrocontrollers (MCU/MPU/SOC)
SX1281IMLTRT
QFN-24-EP(4x4)-132dBm -40℃~+85℃ 1.8V~3.7V 12.5dBm 2.4GHz 2.4GHz~2.5GHz 24mA 2Mbps 8.2mA LoRa SPI、UART Supports RSSI function transceiver QFN-24-EP(4x4) RF Transceiver ICs ROHSSEMTECHRF Transceiver ICs
2450FM07D0034T
SMD-4P,1x0.5mm-40℃~+85℃ 0.75dB 2.4GHz~2.5GHz 50Ω 8dB、9.5dB、25dB、30dB、30dB、35dB SMD-4P,1x0.5mm RF Filters ROHSJohanson DielectricsRF Filters
MLZ2012M150WT000
0805120mA 15uH 250mA 2MHz 950mΩ Multilayer inductor ±20% 0805 Inductors (SMD) ROHSTDKInductors (SMD)
2450AT18A100E
1206-40℃~+125℃ 0.5dBi 1.3mm 1.6mm 2.4GHz 2W 3.2mm 50Ω Patch Antenna SMA 1206 Antennas ROHSJohanson DielectricsAntennas
CJ17-400001010B20
SMD1612-4P10pF 40MHz Crystal Oscillator ±10ppm ±20ppm SMD1612-4P Crystals ROHSJiangsu Changjing Electronics Technology (CJ)Crystals
OW7EL89CENUNFAYLC-52M
SMD2016-4PTemperature Compensated Crystal Oscillators (TCXO)YXCXL-1010RGBC-WS2812B-DZ
SMD1010SMD1010 SMT ROHSXINGLIGHTUncategorised
README
README.mdOpenRX Lite
Open-source 2.4 GHz ExpressLRS receiver for small FPV aircraft. OpenRX Lite combines an ESP32-C3 and SX1281 with an on-board ceramic link antenna in a 10.0 x 11.5 mm board.
Specifications
| Band | 2.4 GHz |
| Radio | SX1281 |
| Antenna | On-board ceramic |
| Telemetry power | 13 dBm (20 mW) |
| Protocol | CRSF |
| MCU | ESP32-C3 |
| Input | 5 V pad |
| Firmware | ExpressLRS |
| Flashing | Betaflight passthrough or Wi-Fi |
| Dimensions | 10.0 x 11.5 mm |
| PCB | 6-layer, 1.0 mm |
Technical write-up, part list and layout constraints: AGENTS.md.
In the line
What pairs with what, and what is available: opendrone.be.
Contributing
To load the KiCad-Library, use git submodule update --init or git clone [...] --recurse-submodules
Furthermore, see CONTRIBUTING.md.
License
Hardware licensed under CERN-OHL-S-2.0, see LICENSE.
Parts
47| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 100nF | Capacitor_SMD:C_0201_0603Metric | C5, C6, C9, C12, C13, C14, C17 |
| 6 | 1uF | Capacitor_SMD:C_0201_0603Metric | C4, C10, C15, C23, C25, C28 |
| 4 | 10k | Resistor_SMD:R_0201_0603Metric | R2, R3, R4, R5 |
| 3 | 10nF | Capacitor_SMD:C_0201_0603Metric | C24, C26, C27 |
| 3 | 10uF | Capacitor_SMD:C_0402_1005Metric | C8, C11, C16 |
| 2 | 1.2pF | Capacitor_SMD:C_0201_0603Metric | C21, C22 |
| 2 | 15pF | Capacitor_SMD:C_0201_0603Metric | C1, C3 |
| 1 | 15uH | Inductor_SMD:L_0805_2012Metric | L4 |
| 1 | 1nF | Capacitor_SMD:C_0201_0603Metric | C19 |
| 1 | 2.0nH | Inductor_SMD:L_0201_0603Metric | L3 |
| 1 | 2.5nH | Inductor_SMD:L_0201_0603Metric | L2 |
| 1 | 2450AT18A100E | OpenRX-Shared:ANT-SMD_L3.2-W1.6 | AE1 |
| 1 | 2450FM07D0034T | OpenRX-Shared:FILTER-SMD_4P-L1.0-W0.5-L | FL1 |
| 1 | 24nH | Inductor_SMD:L_0201_0603Metric | L1 |
| 1 | 470nF | Capacitor_SMD:C_0201_0603Metric | C20 |
| 1 | 47948-0001 | OpenRX-Shared:ANT-SMD_47948-0001 | AE2 |
| 1 | 5V | OpenRX-Shared:SolderPad_1.2x2.0mm | TP3 |
| 1 | BOOT | OpenRX-Shared:SolderPad_1.2x2.0mm | TP5 |
| 1 | CJ17-400001010B20 | OpenRX-Shared:CRYSTAL-SMD_4P-L1.6-W1.2-BL | X1 |
| 1 | ESP32-C3 | Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.7x3.7mm | U1 |
| 1 | GND | OpenRX-Shared:SolderPad_1.2x2.0mm | TP4 |
| 1 | OW7EL89CENUNFAYLC-52M | OpenDrone:OSC-SMD_4P-L2.0-W1.6-BL_TXC_7Z | OSC1 |
| 1 | RX | OpenRX-Shared:SolderPad_1.2x2.0mm | TP1 |
| 1 | SX1281IMLTRT | OpenRX-Shared:QFN-24_L4.0-W4.0-P0.50-TL-EP2.6 | U3 |
| 1 | TLV75533PDQNR | OpenRX-Shared:X2SON-4_L1.0-W1.0-P0.65-TL-EP | U2 |
| 1 | TX | OpenRX-Shared:SolderPad_1.2x2.0mm | TP2 |
| 1 | XL-1010RGBC-WS2812B | OpenRX-Shared:LED-SMD_4P-L1.0-W1.0-TL_XL-1010RGBC-WS2812B | D1 |
Questions
How big is the OpenRX Lite PCB?
It measures 10 × 11.5 mm and has 6 copper layers, 1 mm thick.
What parts does the OpenRX Lite use?
47 parts, built around the ESP32-C3FH4, SX1281IMLTRT, 2450FM07D0034T and MLZ2012M150WT000. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the OpenRX Lite KiCad files?
From the OpenDrone-hw/OpenRX-Lite repository on GitHub, at the commit this page was made from: the board is hardware/OpenRX-Lite.kicad_pcb and its schematic hardware/OpenRX-Lite.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the OpenRX Lite design in my own project?
Its repository publishes it under the CERN-OHL-S-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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